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Unformatted text preview: 1. An adult and a child are sitting on adjacent identical swings. Once they get moving, the adult, by comparison to the child, will necessarily swing with [3] A. a much greater period Mass adult> mass child ____ 2. An oscillator at a frequency of 1.25 Hz will make 100 vibrations in [3] D. 80 s 1 vibration = 1 cycle 1hz = 1cycle/s , f = cycle/s = 125 = 100/x x = 80s ____ 3. Suppose a piano tuner hears 4 beats per second when listening to the combined sound from his tuning fork and the piano note being tuned. After slightly tightening the string, he hears 3 beats per second. What should he do? [3] C. Continue tightening the string to raise the string tension. ____ 4. Which of the three musical notes (A, B, or C) displayed one at a time on an oscilloscope screen has the lower pitch? [2] Answer is AAAAAA Key word lower pitch ____ 5. Which is the louder (if they are being detected by equivalent microphones)? [2] Answer is is A because higher amplitude is higher loudnesss ____ 6. The end of a whip antenna is oscillating in SHM with frequency f and amplitude A . Its maximum speed is given by [3] A. 2 f A 2pief=squarerootk/m sovle use formula v= square root (k/m)(A^2-x^2) = 2piefa ____ 7. Which of the following will...
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